Numerical evaluation of the coupled/uncoupled effects of lower marine riser package and/or blowout preventer with a lower flex joint in a hang-off drilling riser

Zhou, Xingkun; Li, Yan; Chen, Jinghao; Li, Wenhua; Duan, Menglan

doi:10.1016/j.oceaneng.2022.113004

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…We used the PIPE288 element type in the ANSYS software to exploit its advantageous properties, such as additional mass (especially with ocean loads), which enables fluid dynamics calculations involving fluid masses and buoyancy loads. Marine environment loads due to seawater, waves, and currents can be simulated using commands such as OCTYPE, OCDATA, and OCTABLE [35]. To verify the accuracy of this approach, we applied a modal analysis to the jumper model proposed by Wang et al [36] and compared the natural frequencies with those obtained in related studies.…”

Section: Solution and Verificationmentioning

confidence: 99%

Subsea jumper damage detection based on fractal analysis and modal characteristics

2024

Brodogradnja

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Subsea jumpers play a critical role in subsea oil and gas production. Structural damage such as cracks is inevitable in subsea jumpers due to the harsh marine environment (internal fluid flow corrosion, high temperature and pressure, etc.). However, the current research on damage detection and evaluation of subsea jumpers is limited, particularly in cases of slight damage. This study thus proposes a method to identify cracks in subsea jumpers based on the modal characteristics and fractal theory. The accuracy of the method is verified by comparing the finite element simulation method via APDL and the analytical method via MATLAB. In addition, the sensitivity of the method to noise is investigated. The results indicate that the method accurately identifies cracks (single and multiple) with a minimum depth of 0.2 mm in various locations on subsea jumpers. This study may hold significant reference value for improving the safety and reliability of subsea jumpers.

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Section: Solution and Verificationmentioning

confidence: 99%